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مقالۀ پژوهشی: پلاتوها و جهشهای مغناطش در نقطههای کوانتومیِ شبکهکاگومه مثلثی بورون | ||
فیزیک کاربردی ایران | ||
دوره 12، شماره 2 - شماره پیاپی 29، تیر 1401، صفحه 55-76 اصل مقاله (2.08 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22051/ijap.2022.38856.1252 | ||
نویسندگان | ||
مسلم زارع بیدسردره* 1؛ علی مدبر اصل2 | ||
1استادیار، گروه فیزیک، دانشگاه یاسوج، یاسوج، ایران. | ||
2استادیار، گروه فیزیک، دانشگاه یاسوج، یاسوج، ایران | ||
چکیده | ||
وجود پدیدههای نوینی چون پلاتوهای مغناطش (ناحیههای با مغناطش ثابت در منحنی مغناطش) و جهش مغناطش (ناپیوستگی در منحنی مغناطش) که به صورت غیرعادی در پذیرفتاری اسپینی در دمای صفر قابل مشاهده هستند، به صورت نظری در یک شبکۀ صفر بعدیِ (نقطه کوانتومیِ) کاگومۀ مثلثیِ بورون که تحت اثر یک پتانسیل خارجی زیرشبکه قرار گرفته است، مطالعه میشود. با تجزیه و تحلیل برهمکنش رودرمن- کیتل- کاسویا- یوشیدا (RKKY)، حالت پایه مغناطیسی شبکۀ کاگومۀ مثلثی در حضور دو اتم ناخالصی مغناطیسی بررسی میشود. ویژگی بارز شبکۀ کاگومۀ مثلثی بور صفر بعدی، شکلگیری پلاتوهای مغناطش در منحنی RKKY بر حسب انرژی فرمی میباشد. پیکربندیهای مکانی ناخالصیهای مغناطیسی، بهطور چشمگیری مکان و شدّت پلاتوها را تغییر میدهد. بر اساس اطلاعات موجود، این نوع پلاتوهایِ مبتنی بر برهمکنش RKKY پیش از این گزارش نشده است. نتایج برای ساختارهایی با اندازۀ محدود (ابعاد محدود) به روشنی تأیید میکنند؛ که هم پهنا و هم مکان پلاتوهای مغناطش با استفاده از یک پتانسیل خارجی و انرژی فرمی، قابل تنظیم و مدیریت هستند. یکی دیگر از نتایج قابل توجه در این محاسبات، رفتار غیرعادی دیگری بنام جهش مغناطش است که همراه با ناپیوستگی در منحنیهای پذیرفتاری اسپینی میباشد. ساختار الکترونی یک شبکۀ کاگومۀ مثلثی بورون میتواند به شدّت تحت تأثیر یک پتانسیل زیرشبکۀ مدوله شدۀ فضایی قرار گیرد؛ چراکه با مدیریت و تغییر پتانسیل خارجی، شکاف نواری و چگالی حالتهای موضعی قابل کنترل میباشند. نتایج بهدست آمده، دانش قابل توجهی در زمینه طراحی آزمایش و ابزار برای ایجاد و شرح فازهای نوین مغناطیسی در علم اسپینترونیک و ابزار مگنتوالکترونیکیِ مبتنی بر شبکههای کاگومۀ مثلثی بورون، فراهم میکنند. | ||
کلیدواژهها | ||
برهمکنش رودرمن- کیتل- کاسویا- یوشیدا؛ نقطههای کوانتومی؛ شبکۀ کاگومۀ مثلثی بورون؛ پلاتو مغناطش؛ جهش مغناطش | ||
عنوان مقاله [English] | ||
Research Paper: Magnetization Plateaus and Magnetization Jumps in Quantum Dots of Boron Triangular Kagome Lattices | ||
نویسندگان [English] | ||
Moslem Zare1؛ Ali Modabberasl2 | ||
1Assistant Professor, Department of Physics, Yasouj University, Yasouj, Iran | ||
2Assistant Professor, Department of Physics, Yasouj University, Yasouj, Iran. | ||
چکیده [English] | ||
An investigation of the modern phenomena of condensed matter physics, called, magnetization plateau and magnetization jump, visible as anomalies in spin susceptibility at zero temperature, have been carried out theoretically in a zero-dimensional boron triangular Kagome lattice (0D-BTKL), namely quantum dots of BTKL, subjected to a staggering sublattice potential. By analyzing the Ruderman-Kittel-Kasuya-Yoshida (RKKY) interaction, the magnetic ground state of the 0D-TKL in the presence of two magnetic adatoms, in the presence of a staggered sublattice potential is evaluated. The important salient feature of the 0D-BTKLs is the emergence of the RKKY plateaus versus the Fermi energy. The spatial configurations of the magnetic impurities dramatically change the quality and quantity of the RKKY plateaus. These RKKY plateaus have not been reported before, to the best of our knowledge. Our finite-size results successfully confirm that both the width and location of the RKKY plateaus are tunable using an external potential and Fermi energy. Another remarkable observation is the nontrivial behavior, namely the magnetization jump, which accompanies the discontinuity in the spin susceptibility curves versus the staggering potential in our calculations. We believe that our results provide significant insights towards designing further experiments to search for the realization of the magnetization plateau phases and magnetization jumps in spintronics and pseudospin electronics devices based on BTKLs. | ||
کلیدواژهها [English] | ||
Magnetization Plateau, Magnetization Jump, Ruderman-Kittel-Kasuya-Yoshida (RKKY) Interaction, Boron Triangular Kagome Lattice | ||
مراجع | ||
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